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Related Experiment Videos

Circadian rhythms during cycling exercise and finger-tapping task.

S Moussay1, F Dosseville, A Gauthier

  • 1Centre de Recherches en Activités Physiques et Sportives (CRAPS UPRES EA 2131), UFR Sciences et Techniques des Activités Physiques et Sportives, Université de Caen Basse Normandie, Caen, France.

Chronobiology International
|January 4, 2003
PubMed
Summary

Highly trained cyclists exhibit daily rhythms in spontaneous pedal rate and motor spontaneous tempo (MST), influenced by core body temperature. These findings suggest a potential link between internal body temperature and cycling performance metrics.

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Area of Science:

  • Chronobiology
  • Exercise Physiology
  • Sports Science

Background:

  • Circadian rhythms significantly influence physiological functions and performance.
  • Understanding daily fluctuations in athletes' motor control and physical output is crucial for optimizing training and competition strategies.

Purpose of the Study:

  • To investigate the circadian variation in spontaneous pedal rate and motor spontaneous tempo (MST) in highly trained cyclists.
  • To explore the relationship between these parameters and core body temperature rhythms.

Main Methods:

  • Ten highly trained cyclists completed five test sessions at different times of day.
  • Participants performed a finger-tapping task to determine MST and a 15-minute submaximal cycling exercise at 50% Wmax.
  • Spontaneous pedal rate, heart rate (HR), and oral temperature were continuously monitored.

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Main Results:

  • Significant circadian variations were observed for mean oral temperature, HR, and MST.
  • Spontaneous pedal rate demonstrated significant daily changes during submaximal exercise, unlike HR.
  • Circadian rhythms of oral temperature and pedal rate were strongly correlated, as were MST and pedal rate.

Conclusions:

  • Spontaneous pedal rate and MST in cyclists exhibit circadian fluctuations, potentially linked to internal body temperature.
  • The strong correlation between MST and pedal rate suggests a common regulatory mechanism, possibly a central brain oscillator.
  • Both MST and pedal rate appear to be influenced by the body's internal temperature rhythm, a key chronobiological marker.